Abstract
An impeller for liquid-phase agitations in chemical processes was designed based on a conventional disk turbine impeller with six flat blades which sucks liquid across the planes including the upper and lower edges of the blades. The altered impeller has a structure for the inflow entrance to be confined to a limited plane including the inner edges of the blades. We call this "closed impeller" and the prototype "open impeller". Liquid flow in the impeller rotational region of a baffled vessel with the closed impeller was examined for the flow path between the neighboring blades of the rotating impeller. Internal flow was compared between the closed and open impellers and modification was made for the structure of the former impeller. An impeller efficiency determined with the flow and power measurements demonstrated that an intention of such a structure was successful for energy transmission through the blades.
